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Mirial Softphone
Professional HD and SD video conferencing on Windows and Mac...
Express Talk VoIP Softphone
Express Talk is a free VoIP SIP based softphone for Mac OS X....
Express Talk Free VoIP Softphone for Mac
Internet phone to make calls on your Mac OS X...
Sip-Creator
Submission information package creator...
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SIP Communicator
Java based VoIP and instant messaging client...
SIP Inspector
Free and open source utility that will simulate SIP messages and scenarios...
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SIP Proxy
Program that will allow you to manipulate SIP traffic...
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Sofia-SIP
Open-source SIP User-Agent library, compliant with the IETF RFC3261 specification...
SIP Express Router
SIP Express Router - Very fast and very flexible SIP server...
GNU SIP Witch
Call and registration server for the SIP protocol...
Distributed SIP Analyzer
Free and open source SIP message analyzer...
Sip Audio Feeding Agent
A free and open source SIP live audio feeding agent...
Express Talk Business VoIP for Mac
Internet phone to make calls on your Mac OS X...